Screw-threaded insert



FIG. 1 is a front elevational view of a screw-threaded insert showing our new design, taken in the direction of arrow I of FIG. 3;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a sectional view taken in the direction of the arrows on line IV--IV of FIG. 3. 

The ornamental design for a screw-threaded insert, as shown. 